世界上覆盖范围最广的计算机网络是()
A.LAN
B.WAN
C.MAN
D.Internet
参考答案:D
何首乌的功效是()
A.益肾健骨,软坚散结
B.固精止带,补脾止泻,益肾养心
C.养血补心,软坚散结
D.滋阴潜阳,退热除蒸,软坚散结
E.润燥滑肠,软坚散结
It was _____ several years ____ I had an opportunity of seeing the bird again .
A.for; before
B.not for ; that
C.for ; when
D.not for ; then